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Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property Plant And Equipment [Line Items]    
Total property and equipment $ 7,282,911 $ 6,971,631
Less accumulated depreciation, depletion and impairment (3,362,203) (2,840,560)
Property and equipment, net 3,920,708 4,131,071
Equipment    
Property Plant And Equipment [Line Items]    
Total property and equipment 6,963,148 6,679,894
Oil and natural gas properties    
Property Plant And Equipment [Line Items]    
Total property and equipment 200,923 196,234
Buildings    
Property Plant And Equipment [Line Items]    
Total property and equipment 96,470 83,465
Land    
Property Plant And Equipment [Line Items]    
Total property and equipment $ 22,370 $ 12,038